On Wed, 13 Jan 2010, Szak�ts Viktor wrote:
Hi,
> Is there a safe way to clear to content of a variable in Harbour?
Indirectly by functions using hb_itemGetWriteCL() on parameters passed
by reference. You can find few functions in HBRTL.
> --- server.prg
> ? "Please enter password:"
> ACCEPT TO pw
> <process pw>
> pw := NIL
> <server loop>
> ---
> I want that the content of 'pw' variable be surely
> cleared from memory.
> Is this currently possible? and how?
You can create dedicated function for such job:
HB_FUNC( HB_SETSPACE )
{
PHB_ITEM pString = hb_param( 1, HB_IT_STRING );
if( pString )
{
ULONG ulSize;
char * buffer;
/* clear RETURN value before calling hb_itemGetWriteCL(),
* it's possible that it contains copy of passed item
*/
hb_ret();
if( hb_itemGetWriteCL( pBuffer, &buffer, &ulSize ) )
memset( buffer, ' ', ulSize );
}
}
And then use it:
hb_setSpace( @pw )
Of course it will work only if pw was not assigned to some other
location and it's the one copy of given text.
best regards,
Przemek
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